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VOLUME 50 (1989) | ISSUE 1 | PAGE 21
Raman scattering by folded ТА and LA phonons in Si-Si0.5Ge0.5 superlattices
The Raman scattering by acoustic phonons in Si—Si0 5 Ge0 5 superlattices with axis along the (111) direction has been studied. The spectra reveal, in addition to the well-known lines of folded LA phonons, an allowed scattering by folded ТА phonons. This is the first observation of the latter type of scattering.